If you want to edit multiple files at once, hover over a file and click the box in the top right corner to select it. Keep selecting files until you’ve selected all that you need. After selecting the first file, an action bar will appear at the bottom of your window.

Click the three-dot icon and select ‘Edit’

The edit modal will appear where you can edit all file fields and add/remove tags.

Edit all the files at once or de-select files to edit them individually.

When you have finished editing, click Save.